pragma solidity ^0.4.24;

library Roles {
  struct Role {
    mapping (address => bool) bearer;
  }

  /**
   * @dev give an account access to this role
   */
  function add(Role storage role, address account) internal {
    require(account != address(0));
    require(!has(role, account));

    role.bearer[account] = true;
  }

  /**
   * @dev remove an account's access to this role
   */
  function remove(Role storage role, address account) internal {
    require(account != address(0));
    require(has(role, account));

    role.bearer[account] = false;
  }

  /**
   * @dev check if an account has this role
   * @return bool
   */
  function has(Role storage role, address account)
    internal
    view
    returns (bool)
  {
    require(account != address(0));
    return role.bearer[account];
  }
}

contract PauserRole {
  using Roles for Roles.Role;

  event PauserAdded(address indexed account);
  event PauserRemoved(address indexed account);

  Roles.Role private pausers;

  constructor() internal {
    _addPauser(msg.sender);
  }

  modifier onlyPauser() {
    require(isPauser(msg.sender));
    _;
  }

  function isPauser(address account) public view returns (bool) {
    return pausers.has(account);
  }

  function addPauser(address account) public onlyPauser {
    _addPauser(account);
  }

  function renouncePauser() public {
    _removePauser(msg.sender);
  }

  function _addPauser(address account) internal {
    pausers.add(account);
    emit PauserAdded(account);
  }

  function _removePauser(address account) internal {
    pausers.remove(account);
    emit PauserRemoved(account);
  }
}

contract Pausable is PauserRole {
  event Paused(address account);
  event Unpaused(address account);

  bool private _paused;

  constructor() internal {
    _paused = false;
  }

  /**
   * @return true if the contract is paused, false otherwise.
   */
  function paused() public view returns(bool) {
    return _paused;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!_paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(_paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() public onlyPauser whenNotPaused {
    _paused = true;
    emit Paused(msg.sender);
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() public onlyPauser whenPaused {
    _paused = false;
    emit Unpaused(msg.sender);
  }
}

library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

contract Ownable {
  address private _owner;

  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );

  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() internal {
    _owner = msg.sender;
    emit OwnershipTransferred(address(0), _owner);
  }

  /**
   * @return the address of the owner.
   */
  function owner() public view returns(address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(isOwner());
    _;
  }

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0));
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

contract ERC20 is IERC20 {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowed;

  uint256 private _totalSupply;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param owner The address to query the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address owner) public view returns (uint256) {
    return _balances[owner];
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param owner address The address which owns the funds.
   * @param spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address owner,
    address spender
   )
    public
    view
    returns (uint256)
  {
    return _allowed[owner][spender];
  }

  /**
  * @dev Transfer token for a specified address
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function transfer(address to, uint256 value) public returns (bool) {
    _transfer(msg.sender, to, value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param spender The address which will spend the funds.
   * @param value The amount of tokens to be spent.
   */
  function approve(address spender, uint256 value) public returns (bool) {
    require(spender != address(0));

    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  /**
   * @dev Transfer tokens from one address to another
   * @param from address The address which you want to send tokens from
   * @param to address The address which you want to transfer to
   * @param value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    public
    returns (bool)
  {
    require(value <= _allowed[from][msg.sender]);

    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
    _transfer(from, to, value);
    return true;
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed_[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param spender The address which will spend the funds.
   * @param addedValue The amount of tokens to increase the allowance by.
   */
  function increaseAllowance(
    address spender,
    uint256 addedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
      _allowed[msg.sender][spender].add(addedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed_[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param spender The address which will spend the funds.
   * @param subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseAllowance(
    address spender,
    uint256 subtractedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
      _allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
  * @dev Transfer token for a specified addresses
  * @param from The address to transfer from.
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function _transfer(address from, address to, uint256 value) internal {
    require(value <= _balances[from]);
    require(to != address(0));

    _balances[from] = _balances[from].sub(value);
    _balances[to] = _balances[to].add(value);
    emit Transfer(from, to, value);
  }

  /**
   * @dev Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param account The account that will receive the created tokens.
   * @param value The amount that will be created.
   */
  function _mint(address account, uint256 value) internal {
    require(account != 0);
    _totalSupply = _totalSupply.add(value);
    _balances[account] = _balances[account].add(value);
    emit Transfer(address(0), account, value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burn(address account, uint256 value) internal {
    require(account != 0);
    require(value <= _balances[account]);

    _totalSupply = _totalSupply.sub(value);
    _balances[account] = _balances[account].sub(value);
    emit Transfer(account, address(0), value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account, deducting from the sender's allowance for said account. Uses the
   * internal burn function.
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burnFrom(address account, uint256 value) internal {
    require(value <= _allowed[account][msg.sender]);

    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
      value);
    _burn(account, value);
  }
}

contract ERC20Pausable is ERC20, Pausable {

  function transfer(
    address to,
    uint256 value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transfer(to, value);
  }

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transferFrom(from, to, value);
  }

  function approve(
    address spender,
    uint256 value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.approve(spender, value);
  }

  function increaseAllowance(
    address spender,
    uint addedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.increaseAllowance(spender, addedValue);
  }

  function decreaseAllowance(
    address spender,
    uint subtractedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.decreaseAllowance(spender, subtractedValue);
  }
}

contract IndividualLockableToken is ERC20Pausable, Ownable{
  using SafeMath for uint256;

  event LockTimeSetted(address indexed holder, uint256 old_release_time, uint256 new_release_time);
  event Locked(address indexed holder, uint256 locked_balance_change, uint256 total_locked_balance, uint256 release_time);

  struct lockState {
    uint256 locked_balance;
    uint256 release_time;
  }

  // default lock period
  uint256 public lock_period = 24 weeks;

  mapping(address => lockState) internal userLock;

  // Specify the time that a particular person's lock will be released
  function setReleaseTime(address _holder, uint256 _release_time)
    public
    onlyOwner
    returns (bool)
  {
    require(_holder != address(0));
	require(_release_time >= block.timestamp);

	uint256 old_release_time = userLock[_holder].release_time;

	userLock[_holder].release_time = _release_time;
	emit LockTimeSetted(_holder, old_release_time, userLock[_holder].release_time);
	return true;
  }
  
  // Returns the point at which token holder's lock is released
  function getReleaseTime(address _holder)
    public
    view
    returns (uint256)
  {
    require(_holder != address(0));

	return userLock[_holder].release_time;
  }

  // Unlock a specific person. Free trading even with a lock balance
  function clearReleaseTime(address _holder)
    public
    onlyOwner
    returns (bool)
  {
    require(_holder != address(0));
    require(userLock[_holder].release_time > 0);

	uint256 old_release_time = userLock[_holder].release_time;

	userLock[_holder].release_time = 0;
	emit LockTimeSetted(_holder, old_release_time, userLock[_holder].release_time);
	return true;
  }

  // Increase the lock balance of a specific person.
  // If you only want to increase the balance, the release_time must be specified in advance.
  function increaseLockBalance(address _holder, uint256 _value)
    public
    onlyOwner
    returns (bool)
  {
	require(_holder != address(0));
	require(_value > 0);
	require(balanceOf(_holder) >= _value);
	
	if (userLock[_holder].release_time == 0) {
		userLock[_holder].release_time = block.timestamp + lock_period;
	}
	
	userLock[_holder].locked_balance = (userLock[_holder].locked_balance).add(_value);
	emit Locked(_holder, _value, userLock[_holder].locked_balance, userLock[_holder].release_time);
	return true;
  }

  // Decrease the lock balance of a specific person.
  function decreaseLockBalance(address _holder, uint256 _value)
    public
    onlyOwner
    returns (bool)
  {
	require(_holder != address(0));
	require(_value > 0);
	require(userLock[_holder].locked_balance >= _value);

	userLock[_holder].locked_balance = (userLock[_holder].locked_balance).sub(_value);
	emit Locked(_holder, _value, userLock[_holder].locked_balance, userLock[_holder].release_time);
	return true;
  }

  // Clear the lock.
  function clearLock(address _holder)
    public
    onlyOwner
    returns (bool)
  {
	require(_holder != address(0));
	require(userLock[_holder].release_time > 0);

	userLock[_holder].locked_balance = 0;
	userLock[_holder].release_time = 0;
	emit Locked(_holder, 0, userLock[_holder].locked_balance, userLock[_holder].release_time);
	return true;
  }

  // Check the amount of the lock
  function getLockedBalance(address _holder)
    public
    view
    returns (uint256)
  {
    if(block.timestamp >= userLock[_holder].release_time) return uint256(0);
    return userLock[_holder].locked_balance;
  }

  // Check your remaining balance
  function getFreeBalance(address _holder)
    public
    view
    returns (uint256)
  {
    if(block.timestamp >= userLock[_holder].release_time) return balanceOf(_holder);
    return balanceOf(_holder).sub(userLock[_holder].locked_balance);
  }

  // transfer overrride
  function transfer(
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(getFreeBalance(msg.sender) >= _value);
    return super.transfer(_to, _value);
  }

  // transferFrom overrride
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(getFreeBalance(_from) >= _value);
    return super.transferFrom(_from, _to, _value);
  }

  // approve overrride
  function approve(
    address _spender,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(getFreeBalance(msg.sender) >= _value);
    return super.approve(_spender, _value);
  }

  // increaseAllowance overrride
  function increaseAllowance(
    address _spender,
    uint _addedValue
  )
    public
    returns (bool success)
  {
    require(getFreeBalance(msg.sender) >= allowance(msg.sender, _spender).add(_addedValue));
    return super.increaseAllowance(_spender, _addedValue);
  }
  
  // decreaseAllowance overrride
  function decreaseAllowance(
    address _spender,
    uint _subtractedValue
  )
    public
    returns (bool success)
  {
	uint256 oldValue = allowance(msg.sender, _spender);
	
    if (_subtractedValue < oldValue) {
      require(getFreeBalance(msg.sender) >= oldValue.sub(_subtractedValue));	  
    }    
    return super.decreaseAllowance(_spender, _subtractedValue);
  }
}

contract TengRiCashCoin is IndividualLockableToken {
  using SafeMath for uint256;

  string public constant name = "TengRi Cash Coin";
  string public constant symbol = "TERI";
  uint8  public constant decimals = 18;

  // 33,300,000,000 
  uint256 public constant INITIAL_SUPPLY = 33300000000 * (10 ** uint256(decimals));

  constructor()
    public
  {
	_mint(msg.sender, INITIAL_SUPPLY);
  }
}